GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
50 results found.
- Fermi trigger No 732299243: Global MASTER-Net observations report
- LIGO/Virgo/KAGRA S231008ap: Identification of a GW compact binary merger candidate
- IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
- Fermi trigger No 675411172: Global MASTER-Net observations report
- IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
- Fermi-LAT Gamma-ray Observations of IceCube-211023A
- IceCube-211023A - IceCube observation of a high-energy neutrino candidate track-like event
- Fermi-LAT Gamma-ray Observations of IceCube-210730A
- Fermi GRB 210615A: Global MASTER-Net observations report
- Fermi-LAT Gamma-ray Observations of IceCube-201120A
- AX J1846.4-0258: Swift-BAT refined analysis
- Swift Detection of an SGR-like flare from AX J1846.4-0258
- Swift-XRT observations of IceCube 200615A
- Fermi-LAT ANTARES 200127.79 coincidence: MASTER alert observation and presence of young pulsar close to error-box
- LIGO/Virgo S191110af: Potential pulsar counterparts
- Fermi-LAT Gamma-ray Observations of IceCube-191001A
- Trigger 896552: Swift detection of PSR B1055-52
- Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
- Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
- Fermi-LAT Gamma-ray Observations of IceCube-171106A
- Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
- Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
- Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
- GRB 170519A: iTelescope T11 optical observations
- Swift Trigger on AXP CXOU J164710.2-455216
- GBM observation of SGR-like burst from the direction of PSR 1119-6127
- Trigger 706396: Swift detection of a short burst from PSR 1119-6127
- SGR 1935+2154: AbAO optical upper limit
- IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
- GRB 120927A: Swift/UVOT Upper Limits
- GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
- Swift detection of short bursts from PSR J1647-4552
- SGR J1834.9-0846: A Neutron Star in W41?
- Swift J1822.3-1606
- SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
- An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
- GRB 100116A: Suzaku WAM observation of the prompt emission
- GRB 070223: Optical Observations
- VLA observation of GRB 070223
- GRB 070223: Swift-XRT Refined Analysis
- GRB 051221: Swift/UVOT upper limits
- GRB050701: Swift-BAT Refined analysis
- Swift trigger 143708 is really GRB 050701
- The Radio Afterglow from the X-ray Rich GRB 011030
- GRB 011030, WSRT radio observations
- GRB011030 - further refinement WFC position
- GRB011030: radio search
- GRB 011030, R-band observations
- BeppoSAX ALERT: Possible X-ray rich GRB011030
- GRB990123, 15-GHz limits